Recently I have checked an option to globally deploy custom Office templates in Office 365. Unfortunatelly there is no such an option but there are two manuall steps:
Category Archives: Azure and Office 365
Azure AD connect, view disconnectors
What is a disconnector?
A staging object that is not linked to a metaverse object is called a disjoined object (or disconnector object). In other words, some attributes from your on-premises Active Directory are not correctly synchronized with Azure Active Directory.
Options to check\view disconnectors?
Azure AD connect group filtering
Using Azure AD connect you have an option to filter by group. The filtering on groups feature allows you to sync only a small subset of objects for a pilot. This feature is only intended to support a pilot deployment. Do not use it in a full-blown production deployment.